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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -64 |
| 2 | 1952 |
| 3 | -37632 |
| 4 | 512400 |
| 5 | -5207936 |
| 6 | 40618368 |
| 7 | -244952576 |
| 8 | 1124362248 |
| 9 | -3684692800 |
| 10 | 6607738816 |
| 11 | 8603838208 |
| 12 | -109557823168 |
| 13 | 389162471040 |
| 14 | -599467398400 |
| 15 | -815811136000 |
| 16 | 6834665221028 |
| 17 | -15689583552384 |
| 18 | 5284986829472 |
| 19 | 66706108652800 |
| 20 | -183175485196256 |
[1,-64,1952,-37632,512400,-5207936,40618368, -244952576,1124362248,-3684692800,6607738816, 8603838208,-109557823168,389162471040, -599467398400,-815811136000,6834665221028, -15689583552384,5284986829472,66706108652800, -183175485196256] |